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Due to safety concerns and the risks associated with an islanded system, current legislation has prohibited the islanded operation of distributed generation. However, operation of a temporary island may be a useful support to the main supply. In particular, in the event of an upstream supply outage, the temporary islanding operation of distributed generator (DG) can provide local supplies to critical...
In this contribution, a method for evaluating and minimizing network related costs for distributed generation in an objective manner is presented. The network optimization tools used provides functionality to realize long-term cost-efficient integration of distributed generation. Besides, short-term measures for connecting distributed generation to an existing network with minimum financial effort...
Automation offers new margins to improve the performance of distribution operation and control. Additional distribution automation is particularly beneficial when it allows the network operators to use the dispersed generation and enhanced load control capabilities and in some case postpone new network upgrades. Such improved flexibility and control of the distribution network is only possible if...
STATCOMs provide controlled VAr compensator for grid voltage support. This paper describes the control of a STATCOM which incorporates a super capacitor energy storage unit. This combination can deliver real power to the grid and, with the support of an enhanced communication network between system elements, offers the potential to improve the stability margin of a given power system.
FACTS (Flexible AC Transmission Systems) and in particular SVC (Static Var Compensator) and STATCOM are devices suitable for voltage stability and power quality improvement in grids. They offer remedies to voltage drops and fluctuations, harmonic distortion, and unbalance between phases, caused for instance by wind generation, heavy industrial processes or high speed rail traffic. The paper gives...
The main particularity of distribution system state estimation is the lack of real-time measurements. In order to establish the state estimation function, pseudo- measurements need to be introduced. As there is generalised uncertainty in the power demand, the load characteristics can be utilised to appropriately model the pseudo-measurements. This paper proposes two new approaches for modelling pseudo-measurements...
This paper proposes, using the distribution network (DN), the deployment of a common communication architecture to support different electrical services. The aim of the architecture proposed is to simplify the development of future smart grids in the current electrical systems.
This paper presents proposed solutions for three problems encountered in power distribution networks. Three novel circuits are proposed for directly identifying the location of open-circuit or short-circuit faults encountered in the network. The validity of the proposed circuits is examined in a real part of Kuwait power distribution network. The proposed circuits provide fault detection capabilities...
This paper demonstrates why and how a stochastic load flow method based on sequential Monte Carlo simulation is applied to the voltage quality analysis of an existing medium voltage network with very high penetration of DG (distributed generation) units. Simulation results exhibit that oversized DG and large R/X ratio of distribution lines could lead to voltage quality issues that cannot be simply...
This paper describes the desktop modelling of a novel automation concept to traditional LV distribution networks based on theEA Technology "SignalSure" system, which is currently in operation on rail signalling circuits in the UK. EA Technology has carried out projects on behalf of a number of UK Distribution Network Operators through the Innovation Funding Initiative (IFI) to assess deployment...
Network planning and design for new distributed generation (DG) connections typically involves considerably more attention than that required for new demand connections. In particular, generation connections involve consideration of voltage rise, voltage flicker and harmonics, together with fault level limits on existing plant.The objective of this project was to develop a DG connection planning system...
The first part of the paper describes the method and tools EDF has developed to create a unique integration infrastructure designed to automate EDF business processes and facilitate future evolutions. The approach to deploy CIMin EDF environment, is a Top-Down approach which creates messages (used to connect two applications) from an Information Model based on CIM. This method is based on the United...
Microturbines (MTs) are currently being deployed as small scale on-site distributed generators for microgrids and smart grids. This calls for extensive off-line and real-time research for analyzing the load following performance of MTs under islanded and grid-connected modes of operation at distribution voltage level. This paper presents development and simulation of MT models to analyze its load...
This paper describes the technical architecture that is being developed for the implementation of a fully active distribution network. This project was launched as a response to the new challenges that EDP Distribution (EDPD) faces regarding the liberalization of the European and Iberian electricity markets and regarding the need to introduce more intelligence to manage and control distribution networks...
The amount of distributed generation (DG) located in distribution networks increases rapidly. This may have certain impacts on the traditional protection methods. To ensure safe and selective operation, these impacts should be taken in to account and included when planning DG interconnection. The distribution network operators (DNOs) are increasingly facing the challenges related to DG. At the same,...
This paper explores a methodology for performing automated switching on high voltage (11 kV) distribution networks to restore supplies following fault trips using an algorithmic approach based on real-time tracing and analysis of the electrical network model held in the Network Management System (NMS). The approach offers a number of advantages over local automation and pre-configured switching schemes:...
Synchronous islanded operation keeps an islanded system in synchronism with the main power system while not being electrically connected. The challenges associated with the multiple-set application are considered in this paper.
Electric Utilities, in a reactive or proactive answer to the new challenges, are adding more intelligence and complexity in their distribution networks ("Smart Grids"). As the grid becomes more intelligent and more complex, the tools to operate it become increasingly important. To be useful, however, those tools must be fully integrated.
A SmartGrid integrates mainly real-time monitoring, automated control systems, power electronics, demand response management and broadband communication. These issues are all very closely related to the secondary transformer station for their practical implementation. In fact, the sensors for monitoring and fault detection, the switches for maneuvering and network reconfiguration, the Low Voltage...
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